Hi,
I kind of get where you are coming from. I started out with Panic Disorder, then moved to serious anxiety, and just when i thought I was getting over that depression kickd in. I have never been depressed before but I did lose a good friend to suicide a couple years ago. I feel like I cant cope with stress or lonliness. Are you on any meds? What is your Diagnosis?
For me, nights are much worse than daytime. I dont know where the suicidal thoughts came from, I have a really great life, a boyfriend an amazing supportive family, a good job, everything I could ask for. But, I am so sad sometimes.
Try watching youtube videos from americas funniest home videos,, that always at least gives me a laugh.

hope this helps.